Build 4.5.0.71 of xlsgen is a pack of 2 fixes.

1) Support for the variant of =CEILING(number, significance) function introduced by Microsoft in Excel 2013. A silent behavorial change was introduced which allows the number to be negative while the significative to remain positive in order to ask for the rounding be the smallest integer instead of highest integer.

2) More fixing of internal shared formulas in cell manipulation scenarios.